CN104807312A - Drying system for solid material - Google Patents
Drying system for solid material Download PDFInfo
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- CN104807312A CN104807312A CN201410041081.XA CN201410041081A CN104807312A CN 104807312 A CN104807312 A CN 104807312A CN 201410041081 A CN201410041081 A CN 201410041081A CN 104807312 A CN104807312 A CN 104807312A
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Abstract
The invention provides a drying system for a solid material. The drying system for the solid material comprises a drier and a washing tower. The drier comprises a material inlet, a material outlet, a plurality of drying units arranged between the material inlet and the material outlet and communicated sequentially with each other, and discharge ports for communicating every two adjacent drying units. The plurality of drying units comprises an upstream drying unit and at least one downstream drying unit. Each drying unit is provided with a material channel for conveying the material and a dust-contained steam discharge port. The washing tower is connected with the dust-contained steam discharge port of the at least one downstream drying unit. The washing tower comprises a pure steam outlet. The washing tower discharges the dust-contained steam through the dust-contained steam discharge port of the downstream drying unit, and discharge the pure steam after washing through the pure steam outlet.
Description
Technical field
The present invention relates to the technical field of dry materials, particularly relate to the drying of solid material.
Background technology
Granule and pressed powder dry technology are widely used in much industry, are especially used to the drying of coal particle.Especially, it is predicted, the oil in place of global brown coal is about 4,000,000,000,000 tons, accounts for 40% of coal reserve.The lignite resource that China finds is about 1,310 hundred million tons, accounts for 13% of Chinese coal available resources.The feature of brown coal is, high-moisture (30%-60%) and low heat value.No matter brown coal are directly burnings or carry out coal gasification in coal plant in power plant, all wish that first it be dry to reduce humidity thus raising service efficiency.Therefore, prior art conducts in-depth research for brown coal drying.
Such as, in prior art, there is a kind of hollow paddle drier (Holo-Flite Drier), its be with steam as indirect heating medium and by industry for drying solid material, as coal particle, especially brown coal.
Existing this hollow paddle drier utilizes cored screw.Heating steam is admitted in hollow screw.And raw material heat in the process be moved forwardly.Therefore, the reproducibility of the warming interface of solid material can be ensured.In such hollow paddle drier, the thermal medium of the condensation in its cored screw is discharged by siphon mechanism, and this siphon pipe need immerse in thermal medium smooth to guarantee outlet.And siphon pipe is along in the central axis insertion hollow screw of hollow screw, adopt such structure, when condensate liquid reaches half height in hollow screw radial direction with after reaching siphonal position, also after namely condensate liquid is full of the latter half of hollow screw, siphon pipe can be entered and also and then from siphonal condensate liquid outlet discharge drier, adopt this drier to carry out in dry process, the Lower Half branch that hollow screw and blade are positioned at below siphon pipe is full of condensate liquid.
In addition, for solid material as brown coal contact drying technique can comprise following three kinds.
1. there is no the drying process of indirect steam
Raw material are sent to drier and carry out contact drying.Dry material is separated in the end of drier with the waste gas comprising indirect steam.Solid material is recovered and concentrate is collected and again utilizes.The gas that should not recycle comprising the indirect steam that between solid particle, carrier gas and material evaporation go out dry after rinsing is discharged into air, and namely the new indirect steam produced is not reused.
2. adopt the drying process (RWE Power AG) of fluidized bed dryer
In the drying process of this typical fluidized bed dryer, tiny raw material dust is sent in fluid bed and also utilizes the superheated steam from circulating fan to carry out sulfuration.After electrostatic precipitator dedusting, the new indirect steam produced will be partially compressed and recycle as thermal medium.Other will be sent to fluid bed by circulating fan and use as curing medium.The condensate liquid that this technique reclaims comprises a large amount of tiny material dust.
3. the technique of indirect steam recycling
In this process, the all indirect steams produced to be sent in evaporimeter by air blast and in evaporimeter to formed by thermal medium in drier and condensate liquid that the temperature difference between this indirect steam is little heat, the steam that condensate liquid regeneration produces will recycle as thermal medium upon compression.
Summary of the invention
The present invention aims to provide a kind of drying system that effectively can reclaim recycling steam.
In one embodiment of the invention, a kind of solid-fuelled drying system is provided, comprise: drier, there is material inlet, material outlet, the multiple drying unit be communicated with successively between material inlet and material outlet and the discharge gate for being communicated with often adjacent two drying units, described multiple drying unit comprises a upstream drying unit and at least one downstream drying unit, and each described drying unit all has material channel for convey materials and dust-laden steam outlet; Scrubbing tower, it is connected to the dust-laden steam outlet of downstream drying unit described at least one, described scrubbing tower comprises clean steam (vapor) outlet, described scrubbing tower washs the dust-laden steam of being discharged by the dust-laden steam outlet of described downstream drying unit, and discharges the clean steam after washing through described clean steam (vapor) outlet.
According to the drying system of the present embodiment, by described drier is divided into upstream and downstream drying unit, and independent dust-laden steam outlet is set respectively on described upstream and downstream drying unit, like this, after material to be dried is admitted to a drying unit of upstream, carry out the drying of the first order, when dried material is warming up to as more than 90 DEG C, the carrier gas existed between solid particle almost leaves solid particle completely, and the rise steam that evaporates in company with solid particle and dust are discharged from the dust-laden steam outlet of upstream drying unit, now material is entered downstream drying unit to proceed drying from the discharge gate between first drying unit and adjacent downstream drying unit of upstream.Because the carrier gas existed between solid particle is discharged, therefore, from first downstream dryer, the dust-laden steam that its each dust-laden steam outlet gives off is the steam and a small amount of dust that evaporate in solid particle dry run substantially.Now, pass through to obtain recycling clean steam simply to the dedusting of dust-laden steaming according to the technical scheme of the embodiment of the present invention, especially the dry steam of drier is used as, compared with the condensate liquid that this and prior art utilize indirect steam to heat, avoid the technical problem that between indirect steam and condensate liquid, the temperature difference is inadequate existed in prior art, and apparatus and process is simple, cost is lower.
It should be noted that, in the above-described embodiments, the dust-laden steam outlet of each downstream drying unit all can be connected to scrubbing tower, is washed the dust-laden steam that it discharges by scrubbing tower.Also the dust-laden steam outlet of portion downstream drying unit just can be made as required to be connected to scrubbing tower, namely only to wash the dust-laden steam of portion downstream drying unit.
According to a preferred embodiment, described drying system also comprises the powder dust separating device of the dust-laden steam outlet being connected to described upstream drying unit.Adopt the drying system of the present embodiment, the steam in the dust-laden steam that the dust-laden steam outlet of described upstream drying unit is discharged and dust are absorbed by powder dust separating device, and carrier gas enters air from exhaust outlet.
According to a preferred embodiment, each drying unit comprises the steam type drying machine structure extended along described material channel, and described steam type drying machine structure comprises steam inlet and condensate liquid outlet.
According to a preferred embodiment, described clean steam (vapor) outlet is communicated to the steam inlet of described steam type drying machine structure.In the present embodiment, the clean steam that the clean steam (vapor) outlet of described scrubbing tower is discharged enters into through the steam inlet of described drier in steam type drying machine structure again again to use as thermal medium, have effectively achieved from described downstream drying unit produce dust-laden steam through simply dealt recycling, this is particularly advantageous.
According to a preferred embodiment, the condensate liquid outlet of described steam type drying machine structure is communicated to described scrubbing tower to provide flushing liquor to scrubbing tower.The present embodiment achieves the recycling of the condensate liquid of condensation in each drying unit dry run.Described drying system can also comprise the compressor be communicated with between described clean steam (vapor) outlet and described steam inlet, to send into after the clean steam of discharging from described clean steam (vapor) outlet again second compression in described steam type drying machine structure through described steam inlet.
According to a preferred embodiment, described scrubbing tower also comprises leakage fluid dram, described powder dust separating device has leakage fluid dram, described drying system also comprises the dust filtering device be communicated with the leakage fluid dram of the leakage fluid dram of described scrubbing tower and/or described powder dust separating device, and described dust filtering device has filtration product outlet and the circulating water outlet for rinsing described powder dust separating device.
In the present embodiment, the cleaning solution of discharging from described powder dust separating device leakage fluid dram, because wherein dustiness is less, therefore also again can be delivered in scrubbing tower and use with the utilization rate improving cleaning solution as flushing liquor.Or, the cleaning solution that described powder dust separating device leakage fluid dram is discharged also can be sent in described dust filtering device and directly filter, the solid material filtered out again can be delivered in drier through the outlet of its filtration product and carry out drying, and filter produce pure recirculated water can through circulating water outlet send in described powder dust separating device continue as cleaning solution use, to improve the utilization rate of the cleaning solution used in drying system further.Or circulating water outlet also can be communicated with described scrubbing tower to provide flushing liquor in scrubbing tower, or directly stores as byproduct.
In order to improve the utilization rate of the flushing liquor being used for scrubbing tower further, preferably, described drying system also comprises circulating pump, and described circulating pump has the inlet of the leakage fluid dram being connected to described scrubbing tower and the leakage fluid dram being communicated with described scrubbing tower and/or dust filtering device.In the present embodiment, the such as middle and upper part that the flushing liquor extracted out from described scrubbing tower leakage fluid dram through described circulating pump can deliver to scrubbing tower through this circulating pump again uses as flushing liquor again, and/or another part is admitted in dust filtering device and carries out Separation of Solid and Liquid.
According to a preferred embodiment of the present invention, the material channel arranged stacked of each drying unit and downward-sloping, and the mass transport direction of adjacent two drying units and incline direction opposite each other and separated by dividing plate.
According to a preferred embodiment of the present invention, described steam type drying machine structure comprises at least one cored screw rotor and for driving the driving mechanism of described cored screw rotor turns.
According to a preferred embodiment, wherein, the hollow paddle that described cored screw rotor comprises axle and extends spirally around this axle, this hollow paddle limits the steam channel be communicated with described steam inlet fluid, described cored screw rotor also comprise be configured to condensate liquid by but steam not by drainage mechanism, described drainage mechanism is communicated with described steam channel and described condensate liquid outlet.
In the present embodiment, described steam channel is limited by hollow paddle, because hollow paddle is positioned at the outside of axle, the position of the drainage mechanism be therefore communicated with this steam channel is positioned at the outside of axle, like this, condensate liquid in steam channel is resulted from without the need to reaching the position of this axle in dry run, just the position below axle is discharged through the self cooling lime set outlet of drainage mechanism, and steam is remained in steam channel, effectively prevent the accumulation of condensate liquid at cored screw internal rotor, drastically increase heat transfer area, improve the drying efficiency of drier.
According to a preferred embodiment, this steam type drying machine structure also comprises to be installed with described axle rotation and is connected to the condensed fluid collection device of described condensate liquid outlet, described drainage mechanism one end connects described steam channel at the outward flange away from described axle of hollow paddle, and the other end connects described condensed fluid collection device.
In the present embodiment, because described drainage mechanism connects described steam channel at the outward flange away from described axle of hollow paddle, the condensate liquid produced in steam channel is owing to being positioned at the bottom of hollow paddle under the effect of gravity and centrifugal force, like this, the condensate liquid produced can directly in bottom through drainage mechanism exhaust steam passage, thus make only to retain in described steam channel a small amount of condensate liquid not water even substantially, thus greatly increase the Existential Space of steam in described steam channel, drastically increase heating surface (area) (HS, improve the rate of heat addition.
According to a preferred embodiment, described steam type drying machine structure comprises multiple described cored screw rotor be arranged side by side, and the hollow paddle of adjacent cored screw rotor is radial superimposed at least partly vertically.
According to a preferred embodiment, adjacent cored screw rotor is configured to rotate along opposite directions.
According to a specific embodiment of the present invention, described drainage mechanism comprises drain valve.
According to a specific embodiment of the present invention, the dust-laden steam outlet of each described drying unit is arranged on the material channel end of this drying unit.
According to one embodiment of present invention, described solid fuel is brown coal.
According to another aspect of the present invention, provide a kind of for drier according to the present invention, especially hollow blade drier.
According to another scheme of the present invention, provide a kind of according to of the present invention for described drier, cored screw rotor in particular for hollow blade drier.
A part for other features and advantages of the present invention will be that those skilled in the art are obvious after reading the application, and another part describes by reference to the accompanying drawings by detailed description of the invention hereafter.
Accompanying drawing explanation
Below, describe embodiments of the invention in detail by reference to the accompanying drawings, wherein:
Fig. 1 illustrates the schematic diagram of drying system according to an embodiment of the invention;
Fig. 2 illustrate the drier for drying system according to an embodiment of the invention transversely cut open overlook and analyse and observe;
Fig. 3 illustrates the front sectional view longitudinally cut open of the drier according to Fig. 2;
Fig. 4 illustrates the front view of the cored screw rotor for drier according to Fig. 2, and wherein part body is removed.
In the present invention, identical Reference numeral is used to represent identical or similar feature.
Detailed description of the invention
Description, describes the exemplary scheme of device disclosed in the present invention in detail.Although provide accompanying drawing to be to present some embodiments of the present invention, accompanying drawing need not be drawn by the size of specific embodiments, and some feature can be exaggerated, to remove or office cuts open to illustrate and explain disclosure of the present invention better.The phrase " in the accompanying drawings " occurred in the description or similar term need not with reference to institute's drawings attached or examples.
Be used to some directional terminology describing accompanying drawing hereinafter, such as " on ", D score, "left", "right", " upwards ", " downwards " and other directional terminology, by being understood to, there is its normal implication and those directions involved when often seeing accompanying drawing of making a comment or criticism.Except as otherwise indicating, directional terminology described in this description is substantially according to conventional drier direction understood by one of ordinary skill in the art.
Term " about " in the present invention, " approximately ", " substantially " and " almost " will be understood by those of ordinary skill in the art and change according to the context using this term within the specific limits.
Fig. 1 shows the drying system of a preferred embodiment of the present invention.Fig. 2 and 3 shows the hollow paddle drier of a preferred embodiment of the drying system that can be used in Fig. 1.
Shown in Figure 1, drying system according to a preferred embodiment of the present invention, comprise drier 100, it has material inlet 161, material outlet 162, stacked multiple drying unit (such as four drying units) as shown in Figure 1 of being communicated with successively and the discharge gate 190 for being communicated with adjacent two drying units, multiple drying unit comprises the upstream drying unit 120 being positioned at upper strata and at least one the downstream drying unit 120 ' being positioned at lower floor, namely has a upstream drying unit 120 and three downstream drying units 120 ' in this embodiment.Upstream and downstream drying unit 120 and 120 ' has for the material channel of convey materials and dust-laden steam outlet 115 and 115 '.Although illustrated in Fig. 1 that between each drying unit be stacked arrangement; but be to be understood that; it can also be other arrangement relation between each drying unit; such as; between each drying unit be arranged in order along mass transport direction as being arranged in order in the horizontal direction or being arranged in order in trapezoidal; often between adjacent two drying units by conveying mechanism convey materials such as such as belts, this does not depart from the scope of protection of the invention.
This drying system also comprises the scrubbing tower 50 of the dust-laden steam outlet 115 ' being communicated at least one downstream drying unit 120 ', and this scrubbing tower 50 is configured to wash the dust-laden steam of being discharged by the dust-laden steam outlet 115 ' of downstream drying unit 120 ' and have clean steam (vapor) outlet 52 and leakage fluid dram 51.Scrubbing tower 50 is such as extracted out dust-laden steam by the dust-laden steam outlet 115 ' of the second blower fan 40 from downstream drying unit 120 ' and is sent in scrubbing tower 50.It is envisioned that second blower fan 40 can be arranged respectively at each downstream drying unit 120 ', also can be that all downstream drying units 120 ' share second blower fan 40.The scrubbing tower 50 of the present embodiment can be the scrubbing tower 50 rushing spray formula.Preferably, the dust-laden steam outlet 115,115 ' of each drying unit is arranged near the material channel end of corresponding drying unit 120,120 '.
In the present embodiment, because drier 100 is divided into stacked upstream and downstream drying unit 120 and 120 ', and independent dust-laden steam outlet 115 and 115 ' is set respectively on upstream and downstream drying unit 120 and 120 ', like this, after material to be dried is admitted to upstream drying unit 120, carry out the drying of the first order, when dried material is warming up to as more than 90 DEG C, the carrier gas existed between solid particle almost leaves solid particle completely and the rise steam that evaporates in company with solid particle and dust are discharged from the dust-laden steam outlet 115 of upstream drying unit 120, now material is entered this downstream drying unit 120 ' to proceed drying from the discharge gate 190 between upstream drying unit 120 and adjacent downstream drying unit 120 '.Because the carrier gas existed between solid particle is discharged, therefore, from first downstream drying unit 120 ', the dust-laden steam that its each dust-laden steam outlet 115 ' gives off is only the steam and a small amount of dust that evaporate in solid particle dry run, this dust-laden steam is after washing through scrubbing tower 50, dust is absorbed by the cleaning solution in this scrubbing tower 50, and clean steam self-cleaning steam (vapor) outlet 52 is discharged, to carry out collecting and/or recycling.
According to a preferred embodiment, as shown in Figure 1, drying system also can comprise the powder dust separating device 30 of the dust-laden steam outlet 115 being connected to upstream drying unit 120.This powder dust separating device 30 has exhaust outlet 31 and leakage fluid dram 32.Such as, the first blower fan 20 is set between dust-laden steam outlet 115 and powder dust separating device 30 to be extracted out by the dust-laden steam in dust-laden steam outlet 115 and to send in powder dust separating device 30.Wherein, the steam that the dust-laden steam of discharging from the dust-laden steam outlet 115 of upstream drying unit 120 comprises and is present in the carrier gas between dried solid particle in a large number, dried solid particle evaporates and dust.Adopt the drying system of the present embodiment, the steam in the dust-laden steam that the dust-laden steam outlet 115 of upstream drying unit 120 is discharged and dust are absorbed by powder dust separating device 30, and carrier gas enters air from exhaust outlet 31.
In the embodiment of hollow paddle drier 100 as shown in Figures 2 and 3, each drying unit comprises the steam type drying machine structure that the material channel along drying unit extends, and steam type drying machine structure comprises steam inlet 128,128 ' and condensate liquid outlet 127,127 '.
Composition graphs 1-3, clean steam (vapor) outlet 52 connects the steam inlet 128,128 ' of steam type drying machine structure.The condensate liquid outlet 127,127 ' of steam type drying machine structure is communicated to scrubbing tower 50 to provide flushing liquor to scrubbing tower 50.In the present embodiment, the clean steam that the clean steam (vapor) outlet 52 of scrubbing tower 50 is discharged to enter into steam type drying machine structure in using again as thermal medium use again through the steam inlet 128,128 ' of steam type drying machine structure, have effectively achieved the recycling of the condensate liquid of condensation the recycling of the clean steam produced from downstream drying unit 120 ' and each drying unit dry run.Wherein, drying system can also comprise the compressor 60 be communicated with between clean steam (vapor) outlet 52 and steam inlet 128,128 ', to send in drier 100 through steam inlet 128,128 ' after the clean steam of being discharged by self-cleaning steam (vapor) outlet 52 again second compression.
As shown in Figure 1, drying system preferably also can comprise the dust filtering device 90 be communicated with the leakage fluid dram 51 of scrubbing tower 50 and/or the leakage fluid dram 32 of powder dust separating device 30, and dust filtering device 90 has filtration product outlet 91 and for providing the circulating water outlet 92 of recirculated water rinsed to powder dust separating device 30.
In the present embodiment, the cleaning solution of discharging from the leakage fluid dram 32 of powder dust separating device 30, because wherein dustiness is less, therefore also again can be delivered in scrubbing tower 50 and use with the utilization rate improving cleaning solution as flushing liquor.Or, the cleaning solution of leakage fluid dram 32 discharge of powder dust separating device 30 also can be sent in dust filtering device 90 and directly filter, the solid material filtered out again can be delivered in drier 100 through its filtration product outlet 91 and carry out drying, and filter produce pure water can through circulating water outlet 92 send into powder dust separating device 30 in continue as washings use, to improve the utilization rate of the cleaning solution used in drying system further.Or circulating water outlet 92 also can be communicated with scrubbing tower 50 to provide flushing liquor in scrubbing tower 50, or directly stores as byproduct.Preferably, at the outer pump 80 arranged for recirculated water is extracted out of the circulating water outlet 92 of dust filtering device 90.
As shown in Figure 1, drying system also preferably includes circulating pump 70 to improve the utilization rate of flushing liquor further, and circulating pump 70 has the inlet 71 of the leakage fluid dram 51 being communicated to scrubbing tower 50 and is communicated with the leakage fluid dram 72 of scrubbing tower 50 and/or dust filtering device 90.In the present embodiment, the flushing liquor extracted out from the leakage fluid dram 51 of scrubbing tower 50 through circulating pump 70 can deliver to the position, such as middle and upper part of scrubbing tower 50 again to use as flushing liquor through this circulating pump 70 again, and/or another part is admitted in dust filtering device 90 and carries out Separation of Solid and Liquid, isolated dust can be sent back in drier 100 again carries out drying.
As shown in Figure 1, the material channel of each drying unit 120,120 ' preferably can be arranged to downward-sloping, as 0 °-15 °, be preferably 5 °-15 °, be more preferably 10 °-15 °, it is even furthermore preferable that 12 °-15 °, preferably 15 °, and often the mass transport direction of adjacent two drying units and incline direction opposite each other and separated by dividing plate 113.Wherein, material channel refers to path and the space of dried material process in each drying unit.Material channel has relatively high high-end and relatively low low side, and drainage mechanism and condensate liquid outlet 127,127 ' are preferably arranged, so that condensate liquid is as the discharge of water near low side.In addition, preferably, steam inlet 128,128 ' and dust-laden steam outlet 115 and 115 ' are arranged near low side.
Continue see Fig. 2 and 3, they illustrate the hollow paddle drier 100 with steam type drying machine structure according to an embodiment of the invention.Drier of the present invention is specially adapted to drying solid granule and pressed powder, is particularly useful for drying brown coal.Although the present invention is particularly preferably applicable to hollow paddle drier and embodiment shown in the drawings also describes in conjunction with hollow paddle drier, but feature of the present invention also correspondingly can be applicable to other suitable drier, especially there is the drier utilizing contact drying, as long as it has sandwich construction, effectively to remove the carrier gas carried in dried material.
In this hollow paddle drier 100, the steam type drying machine structure of each drying unit 120,120 ' can comprising at least one, as shown being five cored screw rotors 200 and the driving mechanism 134 for driving cored screw rotor 200 to rotate.
In an illustrated embodiment, the hollow paddle 122 that cored screw rotor 200 can comprise axle 121 and extend spirally around this axle 121, this hollow paddle 122 limits the steam channel be communicated with steam inlet 128,128 ' fluid, cored screw rotor 200 also comprise be configured to condensate liquid by but steam not by drainage mechanism as drain valve 123, drainage mechanism is communicated with steam channel and condensate liquid outlet 127,127 '.As Fig. 1 and 2, and specifically as shown in Figure 3, this drainage mechanism, be preferably communicated with as drain valve adjacent tilted cored screw rotor 200 lower end hollow paddle 122 in steam channel, especially connect the steam channel in end hollow paddle 122, thus the condensed water produced can rely on gravity to be flowed away by described drainage mechanism.
In the present embodiment, steam channel is limited by hollow paddle 122, because hollow paddle 122 is positioned at the outside of axle 121 as hollow shaft, therefore the position of drainage mechanism as drain valve 123 be communicated with this steam channel is positioned at the outside of axle 121, like this, condensate liquid in steam channel is resulted from without the need to reaching the position of this axle 121 in dry run, just the position below axle 121 is through the self cooling lime set outlet 127 of drainage mechanism, 127 ' discharges, and steam is remained in steam channel, effectively prevent the accumulation of condensate liquid in cored screw rotor 200 inside, drastically increase heat transfer area, improve the drying efficiency of drier 100.
As shown in Figures 2 and 3, this drier preferably also can comprise and to rotate with axle 121 and to be connected to the condensed fluid collection device of condensate liquid outlet 127,127 ', drainage mechanism one end is communicated with steam channel at the outward flange away from axle 121 of hollow paddle 122, and the other end is communicated to condensed fluid collection device.
In the present embodiment, because drainage mechanism is communicated with steam channel at the outward flange away from axle 121 of hollow paddle 122, the condensate liquid produced in steam channel is positioned at the bottom of hollow paddle 122 under the effect of gravity and centrifugal force, like this, the condensate liquid produced can directly in bottom through drainage mechanism exhaust steam passage, thus make in steam channel, only to retain a small amount of condensate liquid and even substantially do not deposit condensate liquid, thus greatly increase the Existential Space of steam in steam channel, increase heating surface (area) (HS, improve the rate of heat addition.
Described cored screw rotor 200 preferably multiple cored screw rotor be arranged side by side, such as shown in Figures 2 and 3 comprise five cored screw rotors 200 be arranged side by side.The hollow paddle 122 of two often adjacent cored screw rotors 200 vertically at least partly radial superimposed (B as shown in Figure 3).Preferably, every two adjacent cored screw rotors 200 are configured to driven-mechanism 134 and drive along opposite directions and rotate, and namely direction of rotation is opposite each other.Such as driving mechanism 134 comprises engine 131 and gear drive, and gear drive comprises gear-box 130, be positioned at this gear-box 130 and drive with the output shaft of engine 131 main drive gear 132 that is connected and be positioned at gear-box 130 and the driven gear 133 engaged with this main drive gear 132.Main drive gear 132 is set in the end of one end away from steam inlet 128,128 ' of the axle 121 of cored screw rotor 200 such as placed in the middle, driven gear 133 is such as set on the axle 121 of other cored screw rotor 200, and corresponding axle 121 can rotation under the rotarily driving of corresponding main drive gear 132 or driven gear 133.Main drive gear 132 rotates under the driving of engine 131, and drives adjacent two driven gears 133 engaged with it to reversely rotate relative to main drive gear 132, thus often adjacent two cored screw rotors 200 reversely rotate each other.
In an illustrated embodiment, drier 100 comprises the shell 160 formed by insulating materials, the material inlet 161 being arranged in shell 160 top, is arranged in the material outlet 162 bottom shell 160, each drying unit is arranged in shell 160.Each drying unit includes 5 cored screw rotors 200 be arranged side by side, and as shown in Figure 4, axle 121 is hollow shaft, this axle 121 is drilled with multiple hole 129 to form the entrance that thermal medium enters hollow paddle 122.Although illustrated in Fig. 4 that hollow shaft exists 5 holes 129; but be to be understood that; the quantity in hole 129 can be any suitable number; preferably be greater than any numerical value of 2; as the axial two ends only in hollow shaft respectively arrange a hole 129; or all have at least one hole between each hollow paddle and hollow pipe, this does not depart from protection scope of the present invention.Cored screw rotor 200 is inclined relative to horizontal the angle as 0-15 °.And the incline direction of cored screw rotor 200 in adjacent two drying units is contrary.Drainage mechanism such as drain valve 123 is arranged near the outer end of hollow paddle 122.Steam pipework outside drier 100 is connected by steam swivel joint 119 with hollow shaft.Steam is entered in hollow paddle 122 by the hole 129 that hollow shaft is drilled to.Dust-laden steam outlet 115,115 ' is arranged on shell 160 on the top of corresponding drying unit 120,120 ' respectively.Dividing plate 113 bottom is provided with stripper 114, and discharge gate 190 is such as arranged on stripper 114.
Composition graphs 1-3, the following describes and utilize the drying system with drier of the present invention to the drying process of brown coal.
Brown coal pulverized after through top material inlet 161, be admitted to upstream drying unit 120.Brown coal move to the other end under the effect of gravity and spiral force.In transportation, brown coal are in active state all the time under the effect of the hollow paddle of two adjacent reverse rotations.Steam Heating brown coal in axle 121 and hollow paddle 122.When brown coal are heated to more than 90 DEG C, namely the water on brown coal surface be steam by partial gasification.These steams drive the intergranular carrier gas of brown coal to their upper space.The steam produced and driven carrier gas and dust are discharged by the dust-laden steam outlet 115 be positioned on shell 160.
The condensate liquid that thermal medium produces as vapours is under gravity along the outer end edges of the bottom of each hollow paddle 122 to downstream to last hollow paddle 122.Condensate liquid is separated with condensed fluid collection device by the drain valve 123 be arranged on last hollow paddle 122 outward flange, and condensed fluid collection device such as comprises condensate liquid conduit 124, being set in also can with axle 121 with the condensed fluid collection dish 125 turned and condensate collector 126 on axle 121.Finally, condensate liquid discharges drier 100 by condensate liquid outlet 127,127 '.The present embodiment such as utilizes the rotary speed controlling axle 121 to make, when brown coal are along when moving to close discharge gate 190 between hollow paddle 122, to be heated at least 90 DEG C.When this temperature, the carrier gas existed between brown coal is discharged, include carrier gas in the process, the dust-laden steam of steam that brown coal evaporate and dust to extract out from dust-laden steam outlet 115 through the first blower fan 20 and enter dirt air separation 30 such as circulating water container and carry out cooling also dirt gas separation, steam and dust are absorbed by the washings in dirt air separation 30, and uncooled carrier gas then enters air from exhaust outlet 31.
The brown coal moving to discharge gate 190 are fallen in the downstream drying unit 120 ' continued and are proceeded drying.With mentioned the same above, brown coal are heated to 105-110 DEG C further, the water component of brown coal is vaporized as steam (also referred to as indirect steam), and the dust-laden steam that each downstream drying unit 120 ' is discharged is extracted out to recycle by the second blower fan 40 by corresponding dust-laden steam outlet 115 '.After multistage drying completes, the brown coal met the demands discharge drier 100 through material outlet 162.The condensate liquid produced by the thermal medium in axle 121 and hollow paddle 122 is under gravity along the bottom margin of each hollow paddle 122 to downstream to last propeller blade.When be arranged on the drain valve 23 on last hollow paddle 122 rotate to its comparatively low spot time, condensate liquid is separated into static condensate collector 26 through condensed fluid collection dish 125, condensate liquid conduit 124.Finally, the condensate liquid of about 130-160 DEG C discharges drier 100 by the condensate liquid outlet 127 in pipe-line system, and enters scrubbing tower 50 by pipeline and use as flushing liquor.Preferably, flushing liquor in scrubbing tower 50 is saturation water (namely having the water of the vapor phase boiling point together discharged with the dust-laden steam outlet 115 ' of downstream drying unit 120 '), like this steam be saturated water rinse or washing process in substantially there is not heat exchange, and be only quality transmission.
The clean steam produced after washing is discharged through clean steam (vapor) outlet 52 and is such as compressed to 3-6 bar (i.e. 0.3-0.6KPa) by compressor 60 and is sent in cored screw rotor and recycles.Washings are recycled pump 70 and reclaim.Meanwhile, based on mass balance, the moisture be separated in solid drying process is sent to filter in dust filtering device 90, and the pure water part on its top is admitted to as recirculated water in dirt air separation 30, and another part can be taken out of border as byproduct.And filter cake mainly brown coal raw material, it is sent back in drier 100 and carries out drying.Dry brown coal are discharged from the material outlet 162 of drier 100 and send into other device.
The foregoing describe preferred embodiment of the present invention, and can exchange between feature in these embodiments, substitute or combination.
Be to be understood that, although this description describes according to each embodiment, but not each embodiment only comprises an independently technical scheme, this narrating mode of description is only for clarity sake, those skilled in the art should by description integrally, technical scheme in each embodiment also through appropriately combined, can form other embodiment that it will be appreciated by those skilled in the art that.
The foregoing is only the schematic detailed description of the invention of the present invention, and be not used to limit scope of the present invention.Any those skilled in the art, the equivalent variations done under the prerequisite not departing from design of the present invention and principle, amendment and combination, all should belong to the scope of protection of the invention.
Reference numerals list
20-first blower fan
30-dirt air separation
31-exhaust outlet
The leakage fluid dram of 32-dirt air separation
40-second blower fan
50-scrubbing tower
The leakage fluid dram of 51-scrubbing tower
The clean steam (vapor) outlet of 52-
60-compressor
70-circulating pump
The inlet of 71-circulating pump
The leakage fluid dram of 72-circulating pump
80-pump
90-dust filtering device
91-filtration product exports
92-circulating water outlet
100-drier;
113-dividing plate
114-stripper
115,115 '-dust-laden steam outlet
120-upstream drying unit;
120 '-downstream drying unit;
121-axle
122-hollow paddle
123-drain valve
124-condensate liquid conduit
125-condensed fluid collection dish
126-condensate collector
127,127 '-condensate liquid outlet
128,128 '-steam inlet
129-hole
130-gear-box
131-engine
132-main drive gear
133-driven gear
134-driving mechanism
160-shell
161-material inlet
162-material outlet
190-discharge gate
200-cored screw rotor
Claims (16)
1. a drying system for solid material, comprising:
Drier, it has material inlet, material outlet, the multiple drying unit be communicated with successively between material inlet and material outlet and the discharge gate for being communicated with often adjacent two drying units, described multiple drying unit comprises a upstream drying unit and at least one downstream drying unit, and each described drying unit all has material channel for convey materials and dust-laden steam outlet; And
Scrubbing tower, it is connected to the dust-laden steam outlet of downstream drying unit described at least one, described scrubbing tower comprises clean steam (vapor) outlet, described scrubbing tower washs the dust-laden steam of being discharged by the dust-laden steam outlet of described downstream drying unit, and discharges the clean steam after washing through described clean steam (vapor) outlet.
2. drying system according to claim 1, also comprises the powder dust separating device of the dust-laden steam outlet being connected to a described upstream drying unit.
3. drying system according to claim 1 and 2, wherein, each described drying unit includes the steam type drying machine structure extended along described material channel, and described steam type drying machine structure comprises steam inlet and condensate liquid outlet.
4. drying system according to claim 3, wherein, described clean steam (vapor) outlet is communicated to the steam inlet of described steam type drying machine structure.
5. drying system according to claim 3, the condensate liquid outlet of wherein said steam type drying machine structure is communicated to described scrubbing tower to provide flushing liquor to scrubbing tower.
6. drying system according to claim 2, wherein said scrubbing tower also comprises leakage fluid dram, described powder dust separating device has leakage fluid dram, described drying system also comprises the dust filtering device be communicated with the leakage fluid dram of the leakage fluid dram of described scrubbing tower and/or described powder dust separating device, and described dust filtering device has filtration product outlet and the circulating water outlet for rinsing described powder dust separating device.
7. drying system according to claim 6, wherein, described drying system also comprises circulating pump, and described circulating pump has the inlet of the leakage fluid dram being connected to described scrubbing tower and is communicated to the leakage fluid dram of described scrubbing tower and/or described dust filtering device.
8. drying system according to claim 1, wherein, the material channel of each drying unit is arranged stacked and downward-sloping, and the mass transport direction of adjacent two drying units and incline direction opposite each other and separated by dividing plate.
9. drying system according to claim 3, wherein, described steam type drying machine structure comprises at least one cored screw rotor and for driving the driving mechanism of described cored screw rotor turns.
10. drying system according to claim 9, wherein, the hollow paddle that described cored screw rotor comprises axle and extends spirally around this axle, this hollow paddle limits the steam channel be communicated with described steam inlet fluid, described cored screw rotor also comprise be configured to condensate liquid by but steam not by drainage mechanism, described drainage mechanism is communicated with described steam channel and described condensate liquid outlet.
11. drying systems according to claim 10, wherein, this steam type drying machine structure also comprises to be installed with described axle rotation and is connected to the condensed fluid collection device of described condensate liquid outlet, described drainage mechanism one end connects described steam channel at the outward flange away from described axle of this hollow paddle, and the other end connects described condensed fluid collection device.
12. drying systems according to claim 10, wherein, described steam type drying machine structure comprises multiple described cored screw rotor be arranged side by side, and the hollow paddle of every two adjacent cored screw rotors is radial superimposed at least partly vertically.
13. drying systems according to claim 12, wherein, adjacent cored screw rotor is configured to rotate along opposite directions.
14. drying systems according to claim 10, wherein, described drainage mechanism comprises drain valve.
15. drying systems according to claim 1, wherein, the dust-laden steam outlet of each described drying unit is arranged on the material channel end of this drying unit.
16. drying systems according to claim 1, wherein, described solid fuel is brown coal.
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| CN201410041081.XA CN104807312B (en) | 2014-01-27 | 2014-01-27 | Drying system for solid material |
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| CN201410041081.XA CN104807312B (en) | 2014-01-27 | 2014-01-27 | Drying system for solid material |
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| CN104807312B (en) | 2017-04-12 |
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